Kim Jong Nam didn't have a heart attack and the medics who conducted his autopsy found no obvious puncture marks or wounds, a top Malaysian health official said Tuesday, compounding the mystery over the North Korean's death.

Dr. Noor Hisham Abdullah, the director-general of Malaysia's Ministry of Health, addressed a packed room of journalists at the morgue where Kim's body is being held, saying that the cause of death won't be released until lab tests from the autopsy are completed.

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Authorities in South Korea believe that Kim, the older, estranged half-brother of North Korean leader Kim Jong Un, was poisoned before he died on February 13. His death is being investigated as murder.

When asked about reports that Kim had been poisoned, Abdullah reiterated that his department was waiting on lab results before making any conclusive statements.

No next of kin have come forward to claim the body, he said.

A diplomatic spat

Diplomatic relations between Malaysia and North Korea have been strained in recent days, culminating with Malaysia summoning Pyongyang's ambassador and recalling its representative to North Korea, according to a statement from Malaysia's Foreign Ministry'

The moves came after Pyongyang's ambassador, Kang Chol, accused Malaysia conspiring with "hostile forces" during the murder prove.

He then told reporters that the investigation was being "politicized by Malaysia in collusion with South Korea."

Also on Monday, security footage surfaced that appeared to show the assault on Kim Jong Nam shortly before his death.

The suspects

Kim died February 13 at the Kuala Lumpur International Airport 2, where he was planning to catch a flight to the Chinese-controlled city of Macau.

He "felt like someone grabbed or held his face from behind" and then started to feel dizzy, according to Selangor State Criminal Investigations Department Chief Fadzil Ahmat.

An ambulance was eventually called to take him to the hospital, but he died en route.

So far, police have arrested four suspects and looking for four more who were believed to have left Malaysia the day of the attack.

One of the people in custody told police she thought she was participating in a gag for a television show.

The four who fled are North Korean, as is one of the four currently in Malaysian custody.

Interpol is assisting with the search of the suspects at large, each of who left Malaysia the day of Kim's death, Malaysian authorities believe.

When asked if North Korea had ordered his murder, a top Malaysian police official merely said, "the four (on the run) hold North Korean nationality, that is all."